Dashpot System

The dashpot is employed to slow the closing of the throttle valve during gear shifting or deceleration. See Fig 1 .

Fig 1: Locating Dashpot Diaphragm

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1. Check the vacuum line for leaks, blockage or a disconnected hose. See Fig 2 .
   Fig 2: Inspecting Vacuum Line For Leaks

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2. Disconnect the vacuum hose from the dashpot diaphragm, and connect a vacuum pump to the hose.
3. Apply vacuum and check the speed the vacuum goes out. Vacuum should go out slowly. If the vacuum holds or goes out quickly, replace the dashpot check valve and retest.
4. Connect a vacuum pump to the throttle valve dashpot control diaphragm. See Fig 3 .
   Fig 3: Connecting Vacuum Pump To Throttle Valve Dashpot Diaphragm

   Courtesy of AMERICAN HONDA MOTOR CO., INC.
5. Apply vacuum and check that the rod pulls in and vacuum holds. If the vacuum does not hold or the rod does not move, replace the dashpot diaphragm and retest.